2011 BWF World Championships – Men's singles

The men's singles tournament of the 2011 BWF World Championships (World Badminton Championships) was held from August 8 to 14. Chen Jin was the defending champion.

Lin Dan defeated Lee Chong Wei 20–22, 21–14, 23–21 in the final.

Seeds

 * 1)  Lee Chong Wei (final)
 * 2) 🇨🇳 Lin Dan (champion)
 * 3)  Peter Gade (semifinals)
 * 4)  Taufik Hidayat (second round)
 * 5) 🇨🇳 Chen Long (first round)
 * 6) 🇨🇳 Chen Jin (semifinals)
 * 7)  Nguyễn Tiến Minh (quarterfinals)
 * 8) 🇨🇳 Du Pengyu (third round)
 * 9) 🇰🇷 Park Sung-hwan (third round)
 * 10) 🇹🇭 Boonsak Ponsana (third round)
 * 11) 🇯🇵 Sho Sasaki (quarterfinals)
 * 12) 🇰🇷 Lee Hyun-il (third round)
 * 13)  Simon Santoso (third round)
 * 14) 🇩🇪 Marc Zwiebler (second round)
 * 15) 🇯🇵 Kenichi Tago (first round)
 * 16) 🇭🇰 Hu Yun (first round)